CN216484427U - Test device for generating cracks by impacting concrete - Google Patents
Test device for generating cracks by impacting concrete Download PDFInfo
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- CN216484427U CN216484427U CN202122380279.9U CN202122380279U CN216484427U CN 216484427 U CN216484427 U CN 216484427U CN 202122380279 U CN202122380279 U CN 202122380279U CN 216484427 U CN216484427 U CN 216484427U
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Abstract
The utility model belongs to the technical field of building materials and structural safety, and particularly relates to a test device for generating cracks by impacting concrete. The utility model comprises a knocking mechanism and a concrete embedded part; the concrete embedded part is embedded in the concrete to be measured, the upper surface of the concrete embedded part is flush with the surface of the concrete, and the knocking mechanism is placed right above the concrete embedded part. According to the utility model, the impact force generated when the knocking mechanism falls to the concrete embedded part embedded in the concrete is used for enabling the concrete to generate a longitudinal crack, so that the damage effect of the impact load on the self-healing concrete is more convenient to analyze, and a good foundation is laid for further researching the damage principle of the impact load on the self-healing concrete.
Description
Technical Field
The utility model belongs to the technical field of building materials and structural safety, and particularly relates to a test device for generating cracks by impacting concrete.
Background
The cement concrete structure can be damaged under the action of stress or other factors to cause microcrack cracks, although the damage is invisible, the concrete can be converted from a continuum into discrete bodies, the transmission characteristic of the concrete is changed, a convenient channel is provided for harmful substances (such as oxygen, carbon dioxide, water, chloride ions, sulfate ions and the like) to invade into the concrete, a series of degradation results such as cement matrix degradation, steel bar corrosion and the like are caused, and the shock resistance and the service life of the concrete structure are reduced. At present, the method in the aspect of structural seismic design is to enlarge the structural size and increase the using amount of reinforcing steel bars, thereby increasing the manufacturing cost of the structure and being unattractive. Therefore, research and development of novel crack self-healing concrete can actively and automatically repair damaged parts, and the development trend of structural and functional integrated concrete is to recover and improve the performance of concrete materials.
In order to meet the requirement of self-healing concrete of cracks and make clear of the self-healing rules and mechanisms of the cracks in the cracked concrete, a device which can enable the concrete to generate cracks and can control the length, width and number of the cracks of the concrete is needed on a test site.
SUMMERY OF THE UTILITY MODEL
In order to facilitate the research on the self-healing rule and mechanism of cracks in cracked concrete and manufacture concrete cracks meeting the requirements, the utility model provides a test device for impacting concrete to generate cracks.
In order to achieve the purpose, the utility model adopts the technical scheme that:
a test device for generating cracks by impacting concrete comprises a knocking mechanism and a concrete embedded part; the concrete embedded part is embedded in the concrete to be measured, the upper surface of the concrete embedded part is flush with the surface of the concrete to be measured, and the knocking mechanism is placed right above the concrete embedded part.
The knocking mechanism comprises a knocking part, a protective cylinder and a bracket; the knocking part is arranged in the protective cylinder, and the upper part of the knocking part is hung at the center of the top of the protective cylinder; the protective cylinder is vertically connected to the bracket.
The knocking part adopts a drop hammer; the top of the drop hammer is connected with a hanging rope; the drop hammer is hung at the center of the top of the pile casing through a hanging rope.
The lower end of the drop hammer is spherical, and the upper end of the drop hammer is provided with a hanging ring.
The concrete embedded part is an integrated structure consisting of a regular triangular prism and two triangular pyramids; the two triangular pyramids are arranged on two end faces of the regular triangular prism.
The protective cylinder is of a cup-shaped structure with a downward opening; the top of the protective cylinder consists of two semicircular steel sheets, and the center of the protective cylinder is provided with a positioning hole; the two semicircular steel sheets are rotatably connected to the top of the pile casing; the side wall of the protective cylinder is provided with a strip-shaped opening with the width of 1-3cm along the vertical direction.
And scale marks are arranged on the side wall of the pile casing.
And a level bubble is arranged on the side wall of the pile casing.
The knocking mechanism and the concrete embedded part are both made of steel.
Has the advantages that:
(1) according to the utility model, the impact force generated when the knocking mechanism falls to the concrete embedded part embedded in the concrete is utilized to enable the concrete to generate a longitudinal crack, so that the damage effect of the impact load on the self-healing concrete is conveniently analyzed, and a good foundation is laid for further researching the damage principle of the impact load on the self-healing concrete.
(2) The concrete embedded part designed by the utility model is composed of a regular triangular prism and two triangular pyramids, so that the generation of longitudinal cracks is facilitated, and when a drop hammer falls onto the embedded part, the impact force acts on the embedded part and generates wedge-shaped force to two ends along the length direction of the embedded part, so that the expected longitudinal cracks are more easily generated.
(3) The top of the pile casing is composed of two semicircular steel sheets which are rotatably connected with the top of the pile casing, and the center of the pile casing is provided with the positioning hole.
(4) According to the utility model, the side wall of the protective cylinder is provided with a strip-shaped opening with the width of 1-3cm along the vertical direction, so that the exhaust effect is realized when the drop hammer falls, and the test precision is ensured.
(5) According to the utility model, the scale marks are arranged on the side wall of the protective cylinder, so that the falling height of the drop hammer is conveniently controlled, and the falling height of the drop hammer required by the expected crack form is ensured.
(6) According to the utility model, the leveling bubble is arranged on the side wall of the protective cylinder, and the falling direction of the drop hammer can be ensured to be vertically downward by adjusting the centering of the leveling bubble.
(7) The perpendicularity of the pile casing is conveniently adjusted through the arrangement of the support, the pile casing can be firmly fixed, and the test precision is ensured.
The foregoing is merely an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to be implemented in accordance with the content of the description, the following is a detailed description of preferred embodiments of the present invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of the present invention;
FIG. 2 is a schematic view of the structure of the drop hammer of the present invention;
FIG. 3 is a top view of a concrete embedment of the present invention;
FIG. 4 is a front view of a concrete embedment of the present invention;
FIG. 5 is a side view of a concrete embedment of the present invention;
FIG. 6 is a front view of the shroud of the present invention;
FIG. 7 is a top view of the shroud of the present invention;
fig. 8 is a schematic view of the mechanism of the stent of the present invention.
In the figure: 1-drop hammer; 2-protecting the cylinder; 3-concrete embedded parts; 4-a scaffold; 5-level bubble; 6-hanging a rope.
The foregoing is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clear and clear, and to implement them in accordance with the content of the description, the following is a detailed description of preferred embodiments of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
referring to fig. 1-8, the test device for generating cracks by impacting concrete comprises a knocking mechanism and a concrete embedded part 3; the concrete embedded part 3 is embedded in the concrete to be measured, the upper surface of the concrete embedded part is flush with the surface of the concrete to be measured, and the knocking mechanism is placed right above the concrete embedded part 3.
When the concrete embedded part knocking device is applied specifically, firstly, the concrete embedded part 3 is embedded in concrete to be tested, the upper surface of the concrete embedded part 3 is ensured to be flush with the surface of the concrete to be tested, and when the concrete to be tested meets the testing requirements, the knocking mechanism is placed right above the concrete embedded part 3; and then, the drop hammer 1 in the knocking mechanism is made to fall to the upper surface of the concrete embedded part 3 to generate impact force on the concrete embedded part, and the impact force makes the concrete generate longitudinal cracks through the concrete embedded part 3, so that subsequent related tests are facilitated.
By adopting the technical scheme of the utility model, the joint forming operation is carried out on the concrete to be detected, and the operation is convenient.
Example two:
referring to a test device for impacting concrete to generate cracks shown in fig. 1 and 8, on the basis of the first embodiment, the impacting mechanism comprises an impacting part, a pile casing 2 and a bracket 4; the knocking part is arranged in the protective cylinder 2, and the upper part of the knocking part is hung at the center of the top of the protective cylinder 2; the protective cylinder 2 is vertically connected to the bracket 4.
In actual use, after the concrete to be tested meets the test requirements, the knocking mechanism is placed right above the concrete embedded part 3; and then the knocking part falls on the upper surface of the concrete embedded part 3 to generate impact force to the concrete embedded part, so that the concrete generates a longitudinal crack, the damage effect of the impact load on the self-healing concrete is conveniently analyzed, and a good foundation is laid for further researching the damage principle of the impact load on the self-healing concrete.
The perpendicularity of the pile casing 2 is conveniently adjusted through the arrangement of the support 4, the pile casing 2 can be firmly fixed, and the test precision is ensured.
Example three:
referring to a test device for generating cracks by impacting concrete shown in fig. 1 and 2, on the basis of the second embodiment, a drop hammer 1 is adopted in the knocking part; the top of the drop hammer 1 is connected with a hanging rope 6; the drop hammer 1 is hung at the center of the top of the casing 2 through a hanging rope 6.
When in actual use, the drop hammer 1 adopts the technical scheme, so that the drop hammer can be conveniently hung at the top of the protective cylinder 2, the distance between the drop hammer and the concrete embedded part 3 can be conveniently adjusted, and the drop hammer is ensured to have preset impact force. The drop hammer 1 is hung at the center of the top of the protective cylinder 2 through the hanging rope 6, so that the center of an embedded part can be centered when the drop hammer falls, and a satisfactory test effect is obtained.
Example four:
referring to the test device for concrete crack generation by impact shown in fig. 1 and 2, in the third embodiment, the lower end of the drop hammer 1 is spherical, and the upper end of the drop hammer 1 is provided with a suspension loop.
When in actual use, the lower end of the drop hammer 1 is set to be spherical, so that the center of the sphere and the center of gravity of the drop hammer 1 are on the same axis, the impact force generated by the drop hammer 1 can be accurately transmitted to the center of the upper surface of the concrete embedded part 3, and the upper end of the drop hammer 1 is provided with a hanging ring which can be used for conveniently hanging the rope 6.
The drop hammer 1 in the embodiment is a heavy object which is axially symmetrical in the vertical direction, the gravity center is arranged at the center of the geometric shape of the drop hammer, and under the action of the dead weight, the drop hammer 1 can be ensured to be positioned at the center of the protective cylinder 2 as long as the rope is arranged at the center of the protective cylinder 2.
The weight of the drop weight 1 can be selected according to the requirements of the test.
Example five:
referring to the test device for generating cracks by impacting concrete shown in fig. 1, 3-5, on the basis of the third embodiment: the concrete embedded part 3 is an integrated structure consisting of a regular triangular prism and two straight triangular pyramids; the two right triangular pyramids are arranged on two end faces of the right triangular prism.
When in actual use, when the concrete embedded part 3 is embedded in the concrete, one side surface of the regular triangular prism faces upwards to be flush with the surface of the concrete. The concrete embedded part 3 adopts the technical scheme, and is beneficial to the generation of longitudinal cracks. When the drop hammer 1 drops on the concrete embedded part 3 and the generated impact force acts on the concrete embedded part 3, the concrete embedded part 3 can generate wedge-shaped force to two ends along the length direction of the concrete embedded part, so that expected longitudinal cracks are more easily generated.
In this embodiment, the connecting surfaces of the right triangular pyramid and the right triangular prism are congruent triangles, and by adopting such a design scheme, an expected longitudinal crack is more easily generated.
Example six:
referring to a test device for generating cracks by impacting concrete shown in fig. 1, 6 and 7, on the basis of the second embodiment: the protective cylinder 2 is of a cup-shaped structure with a downward opening; the top of the protective cylinder 2 consists of two semicircular steel sheets, and the center of the protective cylinder is provided with a positioning hole; the two semicircular steel sheets are rotatably connected to the top of the pile casing 2; the side wall of the protective cylinder 2 is provided with a strip-shaped opening with the width of 1-3cm along the vertical direction.
When in actual use, the top of the pile casing 2 is composed of two rotatable semicircular steel sheets connected to the top of the pile casing 2, and the center of the steel sheets is provided with a positioning hole.
A strip-shaped opening with the width of 1-3cm is formed in the side wall of the protective cylinder 2 along the vertical direction, so that the exhaust effect is achieved when the drop hammer 1 falls, and the test precision is ensured.
Example seven:
referring to a test device for generating cracks by impacting concrete shown in fig. 1, 6 and 7, on the basis of the first embodiment, the second embodiment or the sixth embodiment: and scale marks are arranged on the side wall of the pile casing 2.
Furthermore, a level bubble 5 is arranged on the side wall of the casing 2.
When in actual use, the side wall of the protective barrel 2 is provided with scale marks, so that the falling height of the falling hammer 1 can be conveniently controlled, and the falling height of the falling hammer 1 required by the expected crack form can be ensured. Increasing the height of the drop weight 1 increases the length, number or width of the crack, and decreasing the height of the drop weight 1 decreases the length, number or width of the crack.
Set up air level 5 on the lateral wall of a casing 2, through adjusting between two parties of air level 5, alright ensure that the drop hammer 1 whereabouts direction is vertical downwards, guaranteed experimental precision.
Example eight:
referring to a test device for generating cracks by impacting concrete shown in figures 1, 3-5, on the basis of the first embodiment: the knocking mechanism and the concrete embedded part 3 are both made of steel.
When in actual use, the knocking mechanism and the concrete embedded part 3 are both made of steel products, so that the knocking mechanism and the concrete embedded part 3 have smooth surfaces, stable performance and corrosion resistance, have higher dimensional accuracy during processing, and have the characteristics of light weight, high strength and easy carrying.
Example nine:
referring to fig. 1-8, a test device for generating cracks by impacting concrete is disclosed, on the basis of the first embodiment: the knocking mechanism comprises a knocking part, a pile casing 2 and a bracket 4; the knocking part is arranged in the protective cylinder 2, and the upper part of the knocking part is hung at the center of the top of the protective cylinder 2; the protective cylinder 2 is vertically connected to the bracket 4; the knocking part adopts a drop hammer 1; the top of the drop hammer 1 is connected with a hanging rope 6; the drop hammer 1 is hung at the center of the top of the protective cylinder 2 through a hanging rope 6; the lower end of the drop hammer 1 is spherical, and the upper end of the drop hammer 1 is provided with a hanging ring; the concrete embedded part 3 is an integrated structure consisting of a regular triangular prism and two triangular pyramids; the two triangular pyramids are arranged on two end faces of the regular triangular prism; the protective cylinder 2 is of a cup-shaped structure with a downward opening; the top of the protective cylinder 2 consists of two semicircular steel sheets, and the center of the protective cylinder is provided with a positioning hole; the two semicircular steel sheets are rotatably connected to the top of the pile casing 2; a strip-shaped opening with the width of 1-3cm is formed in the side wall of the protective cylinder 2 along the vertical direction; the side wall of the protective cylinder 2 is provided with scale marks; a level bubble 5 is arranged on the side wall of the casing 2; the knocking mechanism and the concrete embedded part 3 are both made of steel.
When in actual use, the concrete embedded part 3 is embedded in the concrete to be measured, and one side surface of the regular triangular prism in the concrete embedded part 3 is upward and is parallel and level to the surface of the concrete. After the concrete to be tested meets the test requirements, placing the knocking mechanism right above the concrete embedded part 3; and then, the drop hammer 1 in the knocking mechanism is made to fall to the upper surface of the concrete embedded part 3 to generate impact force on the concrete embedded part, and the impact force makes the concrete generate longitudinal cracks through the concrete embedded part 3, so that subsequent related tests are facilitated.
According to the utility model, when the drop hammer 1 is dropped on the concrete embedded part 3 embedded in the concrete, the generated impact force enables the concrete to generate a longitudinal crack, so that the damage effect of the impact load on the self-healing concrete is conveniently analyzed, and a good foundation is laid for further researching the damage principle of the impact load on the self-healing concrete. The concrete embedded part 3 adopts the technical scheme that the concrete embedded part is composed of a regular triangular prism and two triangular pyramids, so that the longitudinal cracks are favorably generated, and when the drop hammer 1 drops onto the embedded part, the impact force acts on the embedded part and generates wedge-shaped force to two ends along the length direction of the embedded part, so that the expected longitudinal cracks are more easily generated. The top of the pile casing 2 adopts the technical scheme that the pile casing is composed of two rotatable semicircular steel sheets connected to the top of the pile casing 2, and a positioning hole is formed in the center of the pile casing 2, so that the drop hammer 1 can be conveniently placed in the pile casing 2, the drop hammer is ensured to be positioned on the axis of the pile casing 2, and the center of an embedded part can be centered when the drop hammer falls. A strip-shaped opening with the width of 1-3cm is formed in the side wall of the protective cylinder 2 along the vertical direction, so that the exhaust effect is achieved when the drop hammer 1 falls, and the test precision is ensured. The arrangement of the scale marks on the side wall of the pile casing 2 facilitates the control of the falling height of the drop hammer 1, and ensures the falling height of the drop hammer 1 required by the expected crack form. The side wall of the casing 2 is provided with a level bubble 5, and the falling direction of the drop hammer 1 can be ensured to be vertically downward by adjusting the level bubble 5 to be centered. The perpendicularity of the pile casing 2 is conveniently adjusted through the support 4, the pile casing 2 can be firmly fixed, and the test precision is ensured.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
In the case of no conflict, a person skilled in the art may combine the related technical features in the above examples according to actual situations to achieve corresponding technical effects, and details of various combining situations are not described herein.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
The foregoing is illustrative of the preferred embodiments of the present invention, and the present invention is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. Any simple modification, equivalent change and modification of the above embodiments according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.
Claims (9)
1. The utility model provides a test device that striking concrete produced crack which characterized in that: comprises a knocking mechanism and a concrete embedded part (3); the concrete embedded part (3) is embedded in the concrete to be tested, and the upper surface of the concrete embedded part is flush with the surface of the concrete; the knocking mechanism is placed right above the concrete embedded part (3).
2. The test device for generating cracks in impact concrete according to claim 1, wherein: the knocking mechanism comprises a knocking part, a protective cylinder (2) and a bracket (4); the knocking part is arranged in the protective cylinder (2), and the upper part of the knocking part is hung at the center of the top of the protective cylinder (2); the protective cylinder (2) is vertically connected to the bracket (4).
3. The test device for generating cracks in impact concrete according to claim 2, wherein: the knocking part adopts a drop hammer (1); the top of the drop hammer (1) is connected with a hanging rope (6); the drop hammer (1) is hung at the center of the top of the protective cylinder (2) through a hanging rope (6).
4. A test device for crack initiation in impact concrete according to claim 3, wherein: the lower end of the drop hammer (1) is spherical, and the upper end of the drop hammer (1) is provided with a hanging ring.
5. The test device for generating cracks in impact concrete according to claim 1, wherein: the concrete embedded part (3) is an integrated structure consisting of a regular triangular prism and two triangular pyramids; the two triangular pyramids are arranged on two end faces of the regular triangular prism.
6. The test device for generating cracks in impact concrete according to claim 2, wherein: the protective cylinder (2) is of a cup-shaped structure with a downward opening; the top of the protective cylinder (2) is composed of two semicircular steel sheets, and the center of the protective cylinder is provided with a positioning hole; the two semicircular steel sheets are rotatably connected to the top of the pile casing (2); the side wall of the protective cylinder (2) is provided with a strip-shaped opening with the width of 1-3cm along the vertical direction.
7. A test device for crack initiation in impact concrete according to claim 2 or 6, wherein: the side wall of the pile casing (2) is provided with scale marks.
8. A test device for crack initiation in impact concrete according to claim 2 or 6, wherein: and a leveling bubble (5) is arranged on the side wall of the protective cylinder (2).
9. The test device for generating cracks in impact concrete according to claim 1, wherein: the knocking mechanism and the concrete embedded part (3) are both made of steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122380279.9U CN216484427U (en) | 2021-09-29 | 2021-09-29 | Test device for generating cracks by impacting concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122380279.9U CN216484427U (en) | 2021-09-29 | 2021-09-29 | Test device for generating cracks by impacting concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216484427U true CN216484427U (en) | 2022-05-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122380279.9U Active CN216484427U (en) | 2021-09-29 | 2021-09-29 | Test device for generating cracks by impacting concrete |
Country Status (1)
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|---|---|
| CN (1) | CN216484427U (en) |
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2021
- 2021-09-29 CN CN202122380279.9U patent/CN216484427U/en active Active
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